Q.How will you convert boric acid to boron nitride ?
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Start your 14-day free trial to unlock the full solution →Heating boric acid drives off water to give boric anhydride (), which is then heated with ammonia at high temperature to form boron nitride, an inorganic analogue of graphite/diamond.
Step 1 — Dehydration of boric acid: On heating, boric acid loses water in stages, ultimately forming boron trioxide (boric anhydride):
Step 2 — Formation of boron nitride: Boron oxide is then heated strongly with excess ammonia gas at a high temperature (around 1073-1273 K), where ammonia both nitrides and reduces/displaces the oxide: Boron nitride (BN) is a white, slippery solid; its 'white graphite' hexagonal form (isoelectronic and isostructural with graphite) consists of alternating B and N atoms in a hexagonal layered lattice, giving i …
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